\documentclass[11pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{verse}
\parindent0em
\usepackage{graphicx}
\parskip=2pt

\def\pl#1{\leavevmode\setbox0\hbox{#1}\setbox1\hbox to \wd0{\hss\raise1.5ex\hbox{\tiny{+}}\hss}\smash{\vtop{\box0\box1}}}

\def\mi#1{\leavevmode\setbox0\hbox{#1}\setbox1\hbox to \wd0{\hss\raise1.5ex\hbox{\tiny{--}}\hss}\smash{\vtop{\box0\box1}}}


\begin{document}
\lilypondfile[quote,noindent]{p1.modif.ly}
\input{psalm05}
\end{document}
